In order to show you the most relevant results, we have omitted some entries

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OK, this is what I have found in my experience. I also get the "In order to show you the most relevant results, we have omitted some entries" when I do certain (more general) searches of one of my sites. But if I do a search for some specific text I know is on one of the omitted pages, that page shows up. In my case, although the page has been omitted from the first search, it still shows up in queries. Also in my case, there are a lot of similar pages, so maybe we could both do with making our pages a little more different.

Each topic has a different celebrity bio for example and most of them are fairly long, lots of different text on the page, every title is different, every meta keyword is different, every meta description is different.

I think that Google probably uses the search query you use to determine which pages are hidden in the way you describe. When doing a site:whatever query, many of the pages are similar with respect to your query, so some are hidden. As long as your individual pages show up when you do queries relevant to their content then I don't think its anything to worry about.